CHAPTER 22 



FOURTH PART OF UBER ENTWICKLUNGSGESCHICHTE: 

 STUDIES ON THE DEVELOPMENT OF MAN 



The final, fourth part of UBER ENTWICKLUNGSGESCHICHTE 1 

 was published fifty-one years after the appearance of the 

 previous parts. Because of conditions which prevented this 

 work from appearing at the proper time, L. Stieda stated the 

 following: "I am publishing the termination of work which the 

 scientific world has awaited for more than fifty years." 



It is known that Baer's study of the history of animal 

 development remained unfinished. The publishing of the second 

 part, begun in 1829, stopped for five years due to incompletion 

 of the manuscript. The publisher Borntrager, in Konigsberg, 

 waited three years for the promised completed work, and finally 

 published the incomplete second volume without a preface, table 

 of contents, or explanation of the tables. 



When Baer left Konigsberg in October 1834, the manuscript 

 of the final part was, apparently, already prepared. He intended 

 to compare his results of the study of human embryos with the 

 analogous observations of other authors upon his arrival in 

 Petersburg. He sent extracts of his manuscript from Konigsberg 

 to Siebold, who published them under the name "Observations on 

 the History of Development of Man. Portions from a letter to 

 the Publisher. "2 In this letter Baer wrote: 



1. Karl Ernst von Baer, UBER ENTWICKLUNGSGESCHICHTE DER 

 THIERE. BEOBACHTUNG UND REFLEXION. Zweiter Theil. 

 Schlussheft. Herausgegeben von Prof. Dr. Ludwig Stieda, 

 Konigsberg, 1898. v + 84 pp. After Stieda' s preface on the 

 second "title" page appeared: "IV Studien aus der Entwick- 

 elungsgeschichte des Menschen." 



2. Baer, "Beobachtungen aus der Entwickelungsgeschichte des 

 Menschen," Aus einem Schreiben an den Herausgegeber JOURN. 

 FUR GEBURTSHILFE, 14 (1835), pp. 400-411. 



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